Stores the visitor's cart in a cookie for a duration of 14 days. (user configurable via Admin interface).
When the visitor (guest) returns to the site, his/her shopping cart is automatically retrieved from the cookie sent by the client's browser.
The feature can be enabled/disabled via the following two keys:
1. Administration->Configuration->My Store->Store Cart In Cookie [true/false]
2. Administration->Life of Cart Cookie (in Days) [Defaults to 14]
I hope someone finds this useful.
Feedback/Suggestions are always welcome.
Acknowledgements: Idea Conceived by Thane Erickson